Reply by Scot

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Posted on Dust Collection; Another Question

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344 posts in 3637 days

#1 posted 01-27-2012 01:27 AM

You are right brtech about the drop off in air flow, other things that add to the drop off are 90’s and undersized piping. The cyclone separator I have was tested with a rotometer ( I was fortunate to know an AC&R tech that had access to one), He had a blower rated at 1500 cfm (1.5 HP I believe), We first tested just the blower and got just over 1400 cfm, after adding the cyclone the drop was down to around 1250 cfm. After installing the complete system in my old shop with A 1.5 HP blower and all main headers made with 6” snap lock ducting, I was right at 1200 cfm. Later I used duct seal on all 90’s, 45’s and joints I had a very noticeable increase in cfm ( never checked with a rotometer to see how much. I now have a 3 HP Grizzly dust collector with canister filters and I sometimes worry that that it will collapse the snap lock ducting if I close all the blast gates LOL. Another thing about the cyclone is that if there are any leaks at all between the cyclone and the dust hopper you will get carry over, I didn’t have the gasket seated properly once and blew saw dust and chips all over yard, at that time my system vented directly outside, but I guess the up side was is that I didn’t need to empty the hopper that day !

-- If the old masters had power tools, they would have used them. So get off your damn High Horse.

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